- Slides: 7
Lattice Multiplication A NEW way to Multiply By: Mrs. Overley 4 th Grade Math Teacher
Lattice • First Look your problem. Multiplication • Determine the number of Directions!!!!!! 36 X 28 digits in the first factor. (The numbers on the Top) • Then determine the number of digits in the second factor. (The numbers on the Bottom) • Now construct (draw) a big box and divide it to where you have the same number of squares needed for the number of digits located in the top and bottom factors. See left.
• Now divide each of the Lattice smaller boxes in half. Multiplication 36 X 28 Like below.
• Now, write the first factor Lattice across the top and the Multiplication 36 X 28 second factor down the side.
Lattice Multiplication 36 X 28 • Now begin to multiply the first factors together, the tens digit goes in the top half of the box and the ones digit goes in the bottom half.
• Now continue multiplying. Lattice (If the answer is a single Multiplication digit, such as 6, then place a 0 in the top half the box and write a 6 in the bottom half. ) 36 X 28
Lattice NMultiplication • Now add each of the columns diagonally. Regroup when necessary. 36 X 28 • Follow the same steps for 3 -digit by 2 -digit numbers! (Or can be used with any multiplication problem!)